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BONE BLACK DISOHARGER POR CONTINUOUS FILTERS. No. 335,602.

Patented Feb. 9, 188.6.

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2 Sheets- Sheet 2.

(No Model.)

F. O. MATTHIBSSEN.

N. PETERS, Fhmo-Lixlhagrapher, walhington, D. (L

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BONE-BLACK DISCHARGER FOR CONTINUOUS FILTERS.

SPEIFCATEQN forming part of Letters Patent No. 335,602, datedlfebruary 9. 1886. Application filed September 18, 1885. Serial No. 177,487. (No model.)

To all whom it may concern:

Be it known that l, FRANZ O. MAT'rHinssEN, ot'lrvington, New York, have invented certain Improvements in BoneBlack Dischargers for Continuous Filters, of which the following is a specification.

This improvement is for employment in con nection with continuous filters for purifying sugar-liquor by the process of upward filtration through bone-black. ln such iilters the bone-black at the bottom of the iilteringchamber requires to be gradually removed as it becomes charged with impurities and loses its decolorizing power.

The invention consists in the provision, at the bottom of the lilteringchamber, of a grate with adjustable rocking bars or slats, which, when held at a prescribed angle of inclination, support the superincumbent bone-black, but when moved to a different angle permit the bone-black to iall by its own gravity through the spaces between the bars or slats into a receiving-chamber, from which it is removed by suitable means without interrupting the continued upward flow of the sugar-liquor through the 'filtering-chamber.

The accompanying drawings of a continuous filter containing this improvement are as follows:

Figure l is a central vertical section. Fig. 2 is a horizontal section through the line w w on Fig. 1, ai't'ording a top view of a portion ofthe grate and of the crank-shaft for imparting reciprocating motion to the grate. Fig. 3 is a horizontal section taken through the same plane as Fig. 2, but on a larger scale. Fig. 4. is a vertical section through the offset line .r .fr on Fig. 3, showing the grate bars or slats in such inclined positions that the discharge of the superincumbent bone-black is prevented. Fig. 5 is a vertical section through the line y g/ on Fig. 3, showing the grate bars or slats rocked into less inclined positions for effecting the discharge of bone-black from the bottom of the iiltering-chamber. Fig. 6 is a side elevation oi" a portion of one of the grate bars or slats, showing one of its trunnions in elevation, and showing the trunnion-bearing and adjoining parts of the structure in vertical section.

The filtering-chamber A, containing a column of boneblack, B, surmounts the receiving-cliainber C, which receives the exhausted bone-black and collected impurities discharged from the bottoni of the ilteringchainber. The column of bone-black in the filtering-chamber is supported upon the horizontal grate D, coniposed of the equidistant parallel rocking slats d d, Snc. The slats d are each pivotally attached to the connecting-rods E c. Each end `of each slat is provided with a flange, d', and

a trunnion, d2. The trunnions are provided with bearings in suitable boxes, which may be fastened to the side walls or to the top of the receiving-chamber G. The trunnions d2 of each slat or bar are in alignment with each other and with the center of a slot, d3, extending longitudinally through the slat from one of its end flanges to the other. The larger portion of each slat is below its axis of oscillation. The lower edge of the slat is preferably formed into a curve, di, of which is upward.

It is not absolutely essential that the slats or grate-bars shall be provided with the slots cl3; but when they are so provided all the superincumbent bone-blaek rests upon portions of the slats which are comparatively distant from their respective axes, and hence during oscillation have a range of movement which makes them especially effective in causing the dislodgrnent and discharge of the bone-black.

Motion to rock the grate bars or slats may be communicated to the connecting-rods E e, respectively, by means of the links E e, pivoted to the inner ends of the horizontal sliding rods El e2, provided with suitably-packed bearings E3 e3 extending through the upper part of the side wall of the receiving-chamber, the outer ends of the sliding rods being respectively connected by the links EL e4 to the cranks F f of the operating-shaft G.

The operating-shaft G may be either continuously or intermittently rotated, or it may be provided with the operatingcrank G', by the application of power -to which the shaft may have imparted to it a variable range o1" rocking motion, according to the range of rocking motion which it may be found useful to give to the grate bars or slats.

It will be understood that varying either the rapidity or the range of motion of the the concave side grate-bars will have the effect of varying the rate of discharge of the exhausted bone-black from the bottom of the filtering-chamber, and that the proper motions for the grate-bars will depend partly upon the sizes of the grains of bone-black employed, and partly upon the proportion of impurities contained in the sugar-liquor which is being filtered, and the consequent degree of rapidity with which the bottom stratum of ,bone-black becomes eX- hausted and requires removal.

I claim as my inventionl. In apparatus for purifying sugar-liquor by the process of upward ltration through a body of bone-black, the combination of a filtering-chamber surmounting a receiving-chamber, with a discharger at the bottom of said filtering-chamber in the form of a grate provided with rocking slats or grate-bars, and means for rocking said slats or grate-bars from 2o positions in which they support and hold up the bone-black'in said filtering-chamber to .positions in which they permit the bone-black F. O. MATTHIESSEN.

Vitnesses:

F. W. MATTHIEssEN, R. C. Howns. 

